Cartesian Ring
Zebrawood/Black
Genuine zebrawood gives every Cartesian Ring its own unmistakable natural grain.
Made from genuine natural materials, with unique variations in color and texture.
Free shipping including trackingOur customers benefit from free and fast shipping. More information here >
24-month warrantyDuring the first 24 months, we take care of any issues that arise through normal use. Learn more >
Free returns till January 31, 2027 | Club AccountSo you can shop for your Christmas gifts with no risk at all, we’re extending our return period until January 31, 2027. Club membership is 100% free—members receive a prepaid return label at no additional cost. Even without an account, you can return items until January 31, 2027; a small label fee applies.
Packaged as a gift?
Description
Visual depictions in a coordinate system are a great resource when it comes to complex mathematical data, and they provide solutions to otherwise difficult problems.
Stay on top of every situation with your ring from the Cartesian Collection! The three-way material combination of unique zebrawood, cork and black stainless steel offers the perfect accompaniment to every outfit and is guaranteed waterproof. With your own “Cartesian”, you’ll be prepared for every occasion and circumstance!
Details
| Ring width | 8 mm |
|---|---|
| Ring size | Available in various sizes |
| Material | 316L stainless steel in black, black cork and real zebrano wood |
What's included
Your model
Storage box
Cork holder
Protective packaging
Find your perfect ring size
Enter your finger circumference or the inner diameter of a ring that fits to calculate your ring size.
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Find your perfect ring size
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Find your perfect ring size
The measurement you entered differs significantly from our standard sizes. Please measure again using our instructions.
Here's how to find your finger circumference in a few steps:
You need:
- A piece of paper or string
- A pen
- A ruler
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Step 1
Wrap a narrow strip of paper or string around the part of the finger where the ring will sit.
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Step 2
Mark the point where the paper overlaps with a fine pen.
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Step 3
Measure the distance to the mark with a ruler in millimetres (mm).
Pro tip: Fingers are usually slightly wider in the evening. Measure at the end of the day for maximum comfort.
Measure the inner diameter
You need:
- A piece of paper or string
- A pen
- A ruler
-
Step 1
Place the ring on a ruler.
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Step 2
Measure the inner diameter from one side to the other.
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Step 3
Round the result to the nearest millimetre.
Core features
Where nature meets craftsmanship
Before it is packaged and shipped, each piece is individually inspected to ensure that it truly meets our high quality standards.
If it passes the test, we’ll package it carefully, securely, and as plastic-free as possible. We include tools and replacement links with watches and Bandlets so you can adjust your product to your size right away at home.
Just a few days later, you’ll be thrilled to find your package waiting on your doorstep! Unpack it quickly and try it on—you can test your items for 24 days and simply send them back if you don’t like them.
If you have any questions or issues, you can reach us through our service form. No waiting on hold or automated responses—our customer support team consists of 15 employees who are always committed to ensuring your satisfaction.
“With Holzkern I always want to express my love for nature and have set myself the goal of creating the perfect piece of nature for everyone.”
